/**
 * The [Faun] project - Java Dynamic scripting in Php
 * 
 * BSD licence
 *
 * Copyright (c) 2009 by Yauhen Yakimovich
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY HABELITZ SOFTWARE DEVELOPMENTS ('HSD') ``AS IS'' 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL 'HSD' BE LIABLE FOR ANY DIRECT, INDIRECT, 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
package org.faun.recognizer;

import java.io.File;
import java.io.IOException;

import org.antlr.runtime.ANTLRFileStream;
import org.antlr.runtime.CommonTokenStream;
import org.antlr.runtime.RecognitionException;
import org.antlr.runtime.tree.CommonTree;
import org.antlr.runtime.tree.CommonTreeNodeStream;

public class PhpFile {

	String filename;
	
	PhpLexer lexer;
	
	PhpParser parser;
	
	PhpRecognizer recognizer;

	PhpSource source;
	
	public PhpFile(String file) throws PhpRecognitionException {
		// some path check
		File f = new File(file);
		if (!(f.exists() && f.canRead())){
			throw new PhpRecognitionException("File "+file+" does not exists or is not readable");
		}
		
		recognize();
	}
	
	private void recognize() throws PhpRecognitionException {
		// PARSE INPUT AND BUILD AST
		//
		// Create a scanner that reads from the input stream passed to us
		if (lexer == null) {
			lexer = new PhpLexer();
		}
		try {
			lexer.setCharStream(new ANTLRFileStream(filename));
		} catch (IOException e) {			
			throw new PhpRecognitionException("Error trying to recognize php file",e);			
		}
		CommonTokenStream tokens = new CommonTokenStream();
		// tokens.discardOffChannelTokens(true);
		tokens.setTokenSource(lexer);		
		tokens.LT(1); // force load
		
		// Create a parser that reads from the scanner
		parser = null;
		parser = new PhpParser(tokens);
		PhpParser.source_return parsedResult;
		try {
			parsedResult = parser.source();
		} catch (RecognitionException e) {
			throw new PhpRecognitionException("Error trying to recognize php file", e);			
		}
		CommonTree tree = (CommonTree) parsedResult.getTree();
		assert (tree != null);
		
		// Build syntax structures
		CommonTreeNodeStream nodes = new CommonTreeNodeStream(tokens);		
		source = null;
		try {
			nodes.setTokenStream(tokens);
			recognizer = new PhpRecognizer(nodes);			
			PhpRecognizer.source_return recognitionResult = recognizer.source();
			assert (recognitionResult.value!=null);
			source = recognitionResult.value;
		} catch (Exception e) {
			throw new PhpRecognitionException("Error trying to recognize php file: ", e);
		}		
	} 
	
	public PhpSource getSource(){
		return source;
	}
}
